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Ozolins, O., Ostrovskis, A., Salgals, T., Kruger, B., Pittala, F., Joharifar, M., . . . Pang, X. (2023). 106.25 Gbaud 4-Level Pulse Amplitude Modulation Links Supporting (2x)100Gigabit Ethernet on Single Lambda. In: 2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC: . Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA.
Open this publication in new window or tab >>106.25 Gbaud 4-Level Pulse Amplitude Modulation Links Supporting (2x)100Gigabit Ethernet on Single Lambda
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2023 (English)In: 2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC, 2023Conference paper, Published paper (Refereed)
Abstract [en]

We experimentally demonstrate and compare EML- and DML-based optical interconnects with 106.25 Gbaud NRZ-OOK and PAM4 for computing applications. The results show that both transmitters can be used to enable optical -amplification-free transmissions with low-complexity DSP.

National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-333810 (URN)10.23919/OFC49934.2023.10117147 (DOI)001009232500503 ()2-s2.0-85161316411 (Scopus ID)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA
Note

QC 20230810

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2024-08-28Bibliographically approved
Ozolins, O., Ostrovskis, A., Salgals, T., Kruger, B., Pittala, F., Joharifar, M., . . . Pang, X. (2023). High-Baudrate SiP and InP Modulators for Data Center Interconnects. In: 2023 31st International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2023: . Paper presented at 31st International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2023, Split, Croatia, Sep 21 2023 - Sep 23 2023. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>High-Baudrate SiP and InP Modulators for Data Center Interconnects
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2023 (English)In: 2023 31st International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2023, Institute of Electrical and Electronics Engineers (IEEE) , 2023Conference paper, Published paper (Refereed)
Abstract [en]

The booming internet traffic sets highly challenging requirements for high-speed computing where low latency is required. This leads to a choice of intensity modulation and direct detection system with the highest baudrate possible. Furthermore, record baudrate supporting modulators will be the key technology for future optical interconnect applications. Therefore, we demonstrated silicon photonics and indium phosphide modulators at highest possible sysmbolrate.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Keywords
Data Center interconnects, indium phosphite, on-off keying, pulse amplitude modulation, Silicon photonics
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-339289 (URN)10.23919/SoftCOM58365.2023.10271574 (DOI)2-s2.0-85174505183 (Scopus ID)
Conference
31st International Conference on Software, Telecommunications and Computer Networks, SoftCOM 2023, Split, Croatia, Sep 21 2023 - Sep 23 2023
Note

Part of ISBN 9798350301076

QC 20231106

Available from: 2023-11-06 Created: 2023-11-06 Last updated: 2023-11-06Bibliographically approved
Ozolins, O., Ostrovskis, A., Salgals, T., Krueger, B., Pittala, F., Joharifar, M., . . . Pang, X. (2023). Optical Amplification -Free 310/256 Gbaud 00K, 197/145 Gbaud PAM4, and 160/116 Gbaud PAM6 EML/DML-based Data Center Links. In: 2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC: . Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA. IEEE
Open this publication in new window or tab >>Optical Amplification -Free 310/256 Gbaud 00K, 197/145 Gbaud PAM4, and 160/116 Gbaud PAM6 EML/DML-based Data Center Links
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2023 (English)In: 2023 OPTICAL FIBER COMMUNICATIONS CONFERENCE AND EXHIBITION, OFC, IEEE , 2023Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate a record 310/256 Gbaud 00K, 197/145 Gbaud PAM4, and 160/116 Gbaud PAM6 EML/DML-based IM/DD links without any optical amplification with performance below the 6.25% overhead HD-FEC threshold after 100 -m/6 -km SMF, respectively.

Place, publisher, year, edition, pages
IEEE, 2023
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-333811 (URN)001009232500550 ()
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 05-09, 2023, San Diego, CA
Note

QC 20230810

Available from: 2023-08-10 Created: 2023-08-10 Last updated: 2023-08-10Bibliographically approved
Ozolins, O., Ostrovskis, A., Salgals, T., Kruger, B., Pittala, F., Joharifar, M., . . . Pang, X. (2023). Optical Amplification-Free 310/256 Gbaud OOK, 197/145 Gbaud PAM4, and 160/116 Gbaud PAM6 EML/DML-based Data Center Links. In: 2023 Optical Fiber Communications Conference and Exhibition, OFC 2023 - Proceedings: . Paper presented at 2023 Optical Fiber Communications Conference and Exhibition, OFC 2023, San Diego, United States of America, May 5 2023 - May 9 2023. Institute of Electrical and Electronics Engineers (IEEE), Article ID Th4B.2.
Open this publication in new window or tab >>Optical Amplification-Free 310/256 Gbaud OOK, 197/145 Gbaud PAM4, and 160/116 Gbaud PAM6 EML/DML-based Data Center Links
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2023 (English)In: 2023 Optical Fiber Communications Conference and Exhibition, OFC 2023 - Proceedings, Institute of Electrical and Electronics Engineers (IEEE) , 2023, article id Th4B.2Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate a record 310/256 Gbaud OOK, 197/145 Gbaud PAM4, and 160/116 Gbaud PAM6 EML/DML-based IM/DD links without any optical amplification with performance below the 6.25% overhead HD-FEC threshold after 100-m/6-km SMF, respectively.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-338619 (URN)10.23919/OFC49934.2023.10117244 (DOI)2-s2.0-85161291609 (Scopus ID)
Conference
2023 Optical Fiber Communications Conference and Exhibition, OFC 2023, San Diego, United States of America, May 5 2023 - May 9 2023
Note

Part of ISBN 9781957171180

QC 20231103

Available from: 2023-11-03 Created: 2023-11-03 Last updated: 2023-11-03Bibliographically approved
Ozolins, O., Joharifar, M., Salgals, T., Louchet, H., Schatz, R., Gruen, M., . . . Pang, X. (2023). Optical Amplification-Free High Baudrate Links for Intra-Data Center Communications. Journal of Lightwave Technology, 41(4), 1200-1206
Open this publication in new window or tab >>Optical Amplification-Free High Baudrate Links for Intra-Data Center Communications
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2023 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 41, no 4, p. 1200-1206Article in journal (Refereed) Published
Abstract [en]

The enormous traffic growth sets a stringent requirement to upgrade short-reach optical links to 1.6 TbE capacity in an economically viable way. The power consumption and latency in these links should be as low as possible, especially for high-speed computing. This is possible to achieve using high baudrate on-off keying links thanks to a better noise tolerance and a relaxed requirement on linearity for electronics and photonics. In this regard, we demonstrate a 200 Gbaud on-off keying link without any optical amplification using an externally modulated laser with 3.3 dBm of modulated output power operating at 1541.25 nm wavelength. We achieve transmission over 200 meters of single-mode fiber with performance below 6.25% overhead hard-decision forward error correction threshold for each baudrate and all selection of modulation formats. We also show 108 Gbaud on-off keying link with superior performance without decision feedback equalizer up to 400 meters of single-mode fiber. In addition, we benchmark the short-reach optical link with 112 Gbaud four-level pulse amplitude modulation and 100 Gbaud six-level pulse amplitude modulation. For 108 Gbaud on-off keying and 112 Gbaud four-level pulse amplitude modulation, we can achieve an even lower bit error rate. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2023
Keywords
On-off keying, optical interconnects, pulse amplitude modulation, Bit error rate, Decision feedback equalizers, Error correction, Light modulation, Optical fiber communication, Optical links, Optical signal processing, Single mode fibers, Baud rate, Bit-error rate, Datacenter, On/off-keying, Optical amplifications, Optical interconnect, Optical-fiber communication, Performance, Single-mode fibers, Traffic growth
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-328817 (URN)10.1109/JLT.2022.3214722 (DOI)000992271600017 ()2-s2.0-85140779169 (Scopus ID)
Note

QC 20230613

Available from: 2023-06-13 Created: 2023-06-13 Last updated: 2023-07-06Bibliographically approved
Ozolins, O., Salgals, T., Louchet, H., Joharifar, M., Schatz, R., Che, D., . . . Pang, X. (2022). Error-Free 108 Gbps On-Off Keying Link for Optical Interconnect Applications. In: 2022 European Conference on Optical Communication, ECOC 2022: . Paper presented at 2022 European Conference on Optical Communication, ECOC 2022, Basel, Switzerland, Sep 18 2022 - Sep 22 2022. Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Error-Free 108 Gbps On-Off Keying Link for Optical Interconnect Applications
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2022 (English)In: 2022 European Conference on Optical Communication, ECOC 2022, Institute of Electrical and Electronics Engineers Inc. , 2022Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate an error-free 108 Gbps OOK link using a C-band externally modulated laser with 3.3 dBm of modulated output power and an O-band directly modulated laser with 7.3 dBm of modulated output power. This paves the way forward for high-speed optical interconnects without FEC.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2022
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-333456 (URN)000925380500157 ()2-s2.0-85146400569 (Scopus ID)
Conference
2022 European Conference on Optical Communication, ECOC 2022, Basel, Switzerland, Sep 18 2022 - Sep 22 2022
Note

Part of ISBN 9781957171159

QC 20230801

Available from: 2023-08-01 Created: 2023-08-01 Last updated: 2023-08-14Bibliographically approved
Ozolins, O., Salgals, T., Louchet, H., Joharifar, M., Schatz, R., Che, D., . . . Pang, X. (2022). High Baudrate Short-Reach Communication. In: Proceedings OECC/PSC 2022 - 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing 2022: . Paper presented at 2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC), Toyama, Japan, July 3-6, 2022. Institute of Electrical and Electronics Engineers (IEEE)
Open this publication in new window or tab >>High Baudrate Short-Reach Communication
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2022 (English)In: Proceedings OECC/PSC 2022 - 27th OptoElectronics and Communications Conference/International Conference on Photonics in Switching and Computing 2022, Institute of Electrical and Electronics Engineers (IEEE) , 2022Conference paper, Published paper (Refereed)
Abstract [en]

We demonstrate a 200 Gbps IM/DD link without any optical amplification using C-band externally modulated laser with 3.3 dBm of modulated output power and O-band directly modulated laser with 7.3 dBm of modulated output power.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2022
Keywords
directly modulated lasers, externally modulated lasers, on-off keying, optical communication
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-329660 (URN)10.23919/OECC/PSC53152.2022.9850148 (DOI)2-s2.0-85136982429 (Scopus ID)
Conference
2022 27th OptoElectronics and Communications Conference (OECC) and 2022 International Conference on Photonics in Switching and Computing (PSC), Toyama, Japan, July 3-6, 2022
Note

Part of ISBN 9784885523366

QC 20230614

Available from: 2023-06-22 Created: 2023-06-22 Last updated: 2024-04-03Bibliographically approved
Pang, X., Hu, W., Jacobsen, G., Popov, S., Chen, J., Ozolins, O., . . . Xiao, S. (2020). 200 Gbps & x002F;Lane IM & x002F;DD Technologies for Short Reach Optical Interconnects. Paper presented at Optical Fiber Communications Conference and Exhibition (OFC), MAR 03-07, 2019, San Diego, CA, USA. Journal of Lightwave Technology, 38(2), 492-503, Article ID 8943295.
Open this publication in new window or tab >>200 Gbps & x002F;Lane IM & x002F;DD Technologies for Short Reach Optical Interconnects
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2020 (English)In: Journal of Lightwave Technology, ISSN 0733-8724, E-ISSN 1558-2213, Vol. 38, no 2, p. 492-503, article id 8943295Article in journal (Refereed) Published
Abstract [en]

Client-side optics are facing an ever-increasing upgrading pace, driven by upcoming 5G related services and datacenter applications. The demand for a single lane data rate is soon approaching 200 Gbps. To meet such high-speed requirement, all segments of traditional intensity modulation direct detection (IM & x002F;DD) technologies are being challenged. The characteristics of electrical and optoelectronic components and the performance of modulation, coding, and digital signal processing (DSP) techniques are being stretched to their limits. In this context, we witnessed technological breakthroughs in several aspects, including development of broadband devices, novel modulation formats and coding, and high-performance DSP algorithms for the past few years. A great momentum has been accumulated to overcome the aforementioned challenges. In this article, we focus on IM & x002F;DD transmissions, and provide an overview of recent research and development efforts on key enabling technologies for 200 Gbps per lane and beyond. Our recent demonstrations of 200 Gbps short-reach transmissions with 4-level pulse amplitude modulation (PAM) and discrete multitone signals are also presented as examples to show the system requirements in terms of device characteristics and DSP performance. Apart from digital coherent technologies and advanced direct detection systems, such as Stokes-vector and Kramers-Kronig schemes, we expect high-speed IM & x002F;DD systems will remain advantageous in terms of system cost, power consumption, and footprint for short reach applications in the short- to mid- term perspective.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2020
Keywords
Digital signal processing, intensity modulation direct detection, optical fiber communication, optical interconnections
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-268785 (URN)10.1109/JLT.2019.2962322 (DOI)000510911600038 ()2-s2.0-85077280601 (Scopus ID)
Conference
Optical Fiber Communications Conference and Exhibition (OFC), MAR 03-07, 2019, San Diego, CA, USA
Note

QC 20200225

Available from: 2020-02-25 Created: 2020-02-25 Last updated: 2024-03-15Bibliographically approved
Ozolins, O., Zhang, L., Udalcovs, A., Louchet, H., Dippon, T., Gruen, M., . . . Chen, J. (2020). 300 Gbps Short-Reach C-Band Optical Links. In: 2020 22nd international conference on transparent optical networks (ICTON 2020): . Paper presented at 22nd International Conference on Transparent Optical Networks (ICTON), JUL 19-23, 2020, Bari, ITALY. IEEE, Article ID Tu.C3.3.
Open this publication in new window or tab >>300 Gbps Short-Reach C-Band Optical Links
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2020 (English)In: 2020 22nd international conference on transparent optical networks (ICTON 2020), IEEE , 2020, article id Tu.C3.3Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
IEEE, 2020
Series
International Conference on Transparent Optical Networks-ICTON, ISSN 2162-7339
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-293633 (URN)10.1109/icton51198.2020.9203391 (DOI)000629119400259 ()
Conference
22nd International Conference on Transparent Optical Networks (ICTON), JUL 19-23, 2020, Bari, ITALY
Note

QC 20210503

Available from: 2021-05-03 Created: 2021-05-03 Last updated: 2023-09-21Bibliographically approved
Ozolins, O., Zhang, L., Udalcovs, A., Louchet, H., DIppon, T., Gruen, M., . . . Chen, J. (2020). 300+ Gbps Short-Reach Optical Communications. In: Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS: . Paper presented at 2020 Conference on Lasers and Electro-Optics, CLEO 2020, 10-15 May 2020. The Optical Society
Open this publication in new window or tab >>300+ Gbps Short-Reach Optical Communications
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2020 (English)In: Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS, The Optical Society , 2020Conference paper, Published paper (Refereed)
Abstract [en]

We review experimental intensity modulation and direct detection demonstrations for short reach optical communications. We also evaluate 8-level PAM and DMT transmitter to deliver 300 Gbps line rate and beyond per single lane in C-band.

Place, publisher, year, edition, pages
The Optical Society, 2020
Keywords
Lasers, Optical properties, Optics, C-bands, Intensity modulation and direct detections, Line rate, Optical communication
National Category
Telecommunications
Identifiers
urn:nbn:se:kth:diva-291321 (URN)10.1364/CLEO_SI.2020.STh3L.6 (DOI)000612090001472 ()2-s2.0-85091651941 (Scopus ID)
Conference
2020 Conference on Lasers and Electro-Optics, CLEO 2020, 10-15 May 2020
Note

QC 20210315

Available from: 2021-03-15 Created: 2021-03-15 Last updated: 2022-06-25Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7056-4379

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